In Greek mythology Danaus (; Danaos), was the twin brother of Aegyptus, a mythical king of Egypt. The myth of Danaus is a foundation legend (or re-foundation legend) of Argos, one of the foremost Mycenaean cities of the Peloponnesus. In Homer's Iliad, "Danaans" ("tribe of Danaë") and "Argives" commonly designate the Greek forces opposed to the Trojans.